Error installing public SSL cert to Identity Manager - Error validating custom certificate

Hi, We are applying SSL cert for our identity manager server In associating the SSL cert to our IDM, GoDaddy needs us to provide CSR (Certificate Signing Request) and need identify which web server type as below.

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WEB SERVER LI

(1) May anyone can advise what web server IDM server is?

We tried Tomcat 4.x/5.x/6.x approach

keytool -keysize 2048 -genkey -alias tomcat -keyalg RSA -keystore tomcat.keystore

GoDaddy has returned a public SSL key and we tried to generate the private key

Generate a 2048 bit RSA Key with command:      "openssl genrsa -des3 -out private.pem 2048"

Finally we have error message "Error validating custom certificate. refer logs for more details."  when submit the cert